:root {
  --bg: #07101a;
  --card: #0e1620;
  --muted: #a6b3bd;
  --gold: #ffd066;
  --accent: #e64b4b;
  --radius: 14px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", sans-serif;
  background: linear-gradient(180deg, var(--bg), #051119 70%);
  color: #e6eef6;
  line-height: 1.5;
}

/* Hero */
.hero {
  padding: 60px 20px;
  text-align: center;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.9)),
    url("/img/backgraud.jpg") center/cover no-repeat;
}
.hero h1 {
  font-family: "Playfair Display", serif;
  font-size: clamp(28px, 4.6vw, 48px);
  color: var(--gold);
}
.hero p {
  color: var(--muted);
  font-size: 1.1rem;
  margin-top: 8px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Section title */
.section-title {
  font-size: 1.6rem;
  margin-bottom: 20px;
  font-family: "Playfair Display", serif;
  color: var(--gold);
  text-align: center;
}

/* Livros */
.grid-books {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.book-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.6);
  transition: transform 0.2s ease;
}
.book-card:hover {
  transform: translateY(-5px);
}
.book-card img {
  width: 100%;
  max-width: 200px;
  border-radius: 10px;
  margin-bottom: 12px;
}
.book-card h3 {
  font-size: 1rem;
  color: var(--gold);
  margin-bottom: 12px;
}

/* Botões */
.btn {
  display: inline-block;
  padding: 10px 18px;
  background: var(--accent);
  color: white;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  transition: all 0.2s ease;
}
.btn:hover {
  background: #b72a2a;
}
.btn.disabled {
  background: #444;
  color: #bbb;
  cursor: not-allowed;
}

/* Footer */
.site-footer {
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===== Parceiros ===== */
.parceiros-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
  margin-top: 24px;
  justify-items: center;
}

.parceiro {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.01)
  );
  padding: 22px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.55);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  width: 100%;
  max-width: 230px;
  min-height: 250px;
}

.parceiro img {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 10px;
  transition: transform 0.25s ease, filter 0.25s ease;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.6);
}

.parceiro-info h3 {
  font-size: 1.1rem;
  color: var(--gold);
  margin: 6px 0 2px;
}

.parceiro-info p {
  font-size: 0.9rem;
  color: var(--muted);
}

.parceiro:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.7);
}

.parceiro:hover img {
  transform: scale(1.08);
  filter: brightness(1.15);
}

/* ===== Responsividade ===== */

/* Tablets */
@media (max-width: 768px) {
  .grid-books {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
  }
  .book-card img {
    max-width: 160px;
  }
  .parceiros-grid {
    gap: 20px;
  }
}

/* Celulares */
@media (max-width: 480px) {
  .hero {
    padding: 40px 14px;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero p {
    font-size: 0.95rem;
  }
  .container {
    padding: 30px 16px;
  }
  .grid-books {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .book-card img {
    max-width: 140px;
  }
  .parceiros-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .parceiro {
    max-width: 90%;
  }
}

@media (max-width: 768px) {
  .parceiros-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
}

@media (max-width: 480px) {
  .parceiros-grid {
    grid-template-columns: 1fr;
  }
  .parceiro {
    max-width: 90%;
  }
}